PaySmart -FastAPI+PayPal Integration

PaySmart is a backend Payment Management System built using FastAPI that integrates PayPal for real-time transactions. It supports user registration, wallet funding, peer-to-peer (P2P) money transfers, and transaction history tracking, with PostgreSQL as the backend database.

---

🔧 Features

• 🔐 User registration with hashed passwords
• 💰 Wallet management (funding and balance tracking)
• 🔁 Peer-to-peer (P2P) transactions between users
• 💳 PayPal integration using REST API and SDK
• 📜 Transaction logging with type and status
• 🗄️ PostgreSQL backend using SQLAlchemy ORM
• ✅ Data validation using Pydantic
• 🧾 Jinja2 templates + static file support
• 🔑 Password hashing with Passlib (bcrypt)

---

📡 API Endpoints

Method	Endpoint	Description
POST	/users/register	Register a new user
POST	/wallets/fund	Fund wallet using PayPal
POST	/create-order	Create PayPal order (REST API)
POST	/capture-order/{order_id}	Capture PayPal order
GET	/payment/success	Callback for successful payment
GET	/payment/cancel	Callback for canceled payment
POST	/transactions/p2p	Transfer funds to another user
POST	/webhook	PayPal webhook listener
GET	/	Basic HTML UI using Jinja2 templates

---

🧪 Testing

• 🧾 Use PayPal sandbox credentials for all test transactions.
• Ensure environment variables like PAYPAL_CLIENT_ID and PAYPAL_CLIENT_SECRET are set in your .env file.

---

📂 Tech Stack

• Backend: FastAPI
• Payment Integration: PayPal REST API & SDK
• Database: PostgreSQL
• ORM: SQLAlchemy
• Authentication: Passlib (bcrypt)
• Templating: Jinja2
• Validation: Pydantic

IMAGES: